My friend, Lee Robb (who tends to see things more clearly than I do at times), had the following comment regarding my unhappiness with running TSS in WKO+ (see previous blog post for my take on it):
"Maybe I'm misunderstanding. Daniels defines T-pace as a 50-60 minute effort, that which elicites a steady state of lactate accululation. 10k intervals for a 30' runner is a vo2max workout (I-pace), wherease 10k intervals for a 60' runner is a threshold workout (T-pace). Threshold pace for a 30' runner is closer to their 20k race pace. "
Initially, I was irritated...not because of what Lee said, but because immediately after reading it, I knew I was wrong in my "logic" somewhere. His point made sense, and worse yet, was right. So I re-evaluated my position and tried to figure out where I went wrong and why despite the above being true, I still didn't like how rTSS was calculated in WKO+.
Physiologically, I have no problem with the threshold pace being set as an hour. LT is usually defined as lactate accumulation over a period of about an hour, regardless of sport. Many swimmers judge their training paces based on their 3K swim time (about an hour), which sould be their approximate LT pace. Okay, so I'm at peace with the idea that WKO+ uses a 1-hour pace as threshold. But there is still something that doesn't sit right with me, and that's what I had to put a lot of thought into.
I finally figured it out. I don't like it from an aesthetic standpoint. I'm planning my season based around TSS for each sport, not time or distance (here). What I would like is to have TSS broadly comparable among the 3 sports so that a TSS of 80 on the bike feels like a run TSS of 80 feels like a swim TSS of 80. But with threshold run pace as a function of a 1-hour time, they aren't that comparable. In my opinion, WKO+ still underestimates the "true" TSS for running. For example, a TSS of 150 on the bike feels nothing like TSS of 150 on the run. The latter would have me taking several days rest, whereas the former would require 1 day rest max. So, I finally figured out why I don't like it...turns out I have to eat crow about it not accurately reflecting a good LT pace, but I still think I'm right on how it underestimates rTSS.